#include <iostream>
#include <string>
using namespace std;

int cow_converter(const string &order, const string &deal) {
  bool mismatched = false; // 找到不相等的字符

  /*
  同时遍历 order 和 deal
  */
  int ans = 0;
  for (int i = 0; i < order.size(); ++i) {
    if (order[i] != deal[i]) {
      if (!mismatched) {
        mismatched = true;
        ++ans;
      }
    }
    else {
      mismatched = false;
    }
  }
}

int main(int argc, char const *argv[])
{
  /* code */
  return 0;
}
